Boiler



G. W. FOLK Nov; 29, 1949 BOILER Filed Oct. 17, 1945 INVENTOR. 660/756 M /0//f BY Patented Nov. 29, 1949 UNITED STATES PATENT OFFICE 2,489,770 BOILER George W. Folk, Kalamazoo, Mich. Application October .17, 1945, Serial No. 622,719

This invention relates to improvements in boilers.

water house heating systems which is simple and economical in structure and at the same time highly efiicient.

Second, to provide a hot water boiler which is formed of sheet steel, the parts being arranged So that heating and contacting resulting from use does not distort the same or weaken the joints.

Third, to provide a boiler which utilizes a large percent of the heat units of the fuel.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a vertical central section on a line corresponding to line -I-I ofFig. 2 of a boiler embodying my invention, the outlet pipe being shown I in full lines and the burner being conventionally illustrated by dotted lines.

Fig. 2 is a horizontal .section on line 2-2 of Fig. 1.

5 Claims. (Cl. 122-182) chamber are welded to the side of the main The embodiment of my invention comprises an upright cylindrical combustion chamber l formed of sheet steel and of uniform section from end to end. The top 2 is preferably domed or concavo convex in shape. The burner 3 shown by dotted lines is desirably .an oil burner although the heating unit may be a gasburner, Qr .grates may be provided for solid fuel. An

opening 4 is provided in the .side of the structure to receive the burner.

The cylindrical upright main water reservoir 5 concentrically surrounds the-combustion chamber. and is provided with a domed top 6 .to which the outlet pipe I is connected. A water inlet or return pipe 8 opens to the bottom of the reservoir. The water space 8! between the side walls of the combustion chamberand the main reservoir is desirably of the order of one inch. A substantially greater space is provided between the top of the combustion .chamber and the top of the main reservoir.

At the side-of the main reservoir isan auxiliaryreservoir 9 comprising flat side walls ii) and a curved outer wall -ll merging into .theside walls. The bottom Wall l2 and the top wall l3 are also. preferably flat. The inner edges .of the side walls and the top and bottom walls of the auxiliary reservoir, the joint not being illustrated. v

Vertically arranged within the auxiliary reser voir is a flue or radiator M of substantial diameter, having a lateral extending arm l5 extending through an opening E6 in the wall of themain reservoir and communicating with the top of the combustion chamber. The flue or radiator member M is of substantial diameter and constitutes a heat exchange unit.

The auxiliary reservoir communicates with the main reservoir at the top of the auxiliary reservoir and also at the bottom thereof through the 019 ing I? in the side wall of the main reservoir. The outlet arm it extends through the outer wall of the auxiliary chamber and is welded thereto.

The outer wall ll of the auxiliary reservoir is concentric to the heat exchange flue and is pref erably spaced therefrom in the order of one inch as is also the case with the top and bottom walls and the adjacent wall of the main reservoir embraced by the auxiliary reservoir.

The top opening l6 extends to the top wall of the auxiliary reservoir and the bottom opening I! to the bottom wall of the auxiliary reservoir so that there are no pockets in the inlet and outlet of the auxiliary reservoir. With this arrangement of parts, the water not only circulates upwardly around the combustion chamber in the main reservoir but flows into the auxiliary reser voir through the opening Hand out through the opening it, thus providing for an effective circulation around the combustion chamber and also around the combined flue and heat exchange member Hi. This results in utilization of a large portion of the heat units of the fuel. f

The parts are so arranged that they are not injuriously affected by contraction and expan-' sion. They may be formed of comparatively light gauge sheet stock and at the same time the structure is very durable. V

I have not attempted to illustrate the various structural modifications or embodiments of my 1 invention as it is believed that this disclosure will enable those skilled in the art to embody or adapt the same as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A boiler comprising anupright cylindrical combustion chamber of uniform diameter and having a domed top, a cylindrical upright mainwater reservoir of uniform diameter concentrically surrounding said combustion chamber and having a domed top, the space between the side walls of the combustion chamber and the main reservoir being in the order of one inch, there being a substantially greater space between the top of the combustion chamber and the top of the water reservoir, the main reservoir having an inlet adjacent the bottom thereof and an outlet at the top thereof, an auxiliary reservoir disposed vertically at the side of the main reservoir and comprising flat side and top and bottom walls and curved outer wall, the inner edges of the side and top and bottom walls being welded to the side of the main reservoir with the top of the auxiliary reservoir in approximately the plane of the top of the combustion chamber, the wall of the main reservoir embraced by said auxiliary reservoir having openings therein opening to the top and bottom of the auxiliary reservoir, the upper edge of the top opening being substantially flush with the top of the auxiliary reservoir, the lower edge of the bottom opening being substantially flush with the bottom of the auxiliary reservoir, and a heat exchange unit and discharge flue for said combustion chamber disposed vertically within said auxiliary reservoir and having a lateral inlet arm at its upper end disposed through the upper opening in said main reservoir wall and welded to the side of the combustion chamber at the top thereof, and a lateral discharge arm at its lower end disposed through the curved outer wall of said auxiliary reservoir adjacent the bottom thereof and welded thereto, the curved outer wall of said auxiliary reservoir being concentric relative to the upright portion of the flue, the space between the flue and the walls of said auxiliary chamber and the adjacent side of the main reservoir being in the order of one inch.

2. A boiler comprising an upright cylindrical combustion chamber of uniform diameter, a cylindrical upright main water reservoir of uniform diameter concentrically surrounding said combustion chamber, the main reservoir having an inlet adjacent the bottom thereof and an outlet at the top thereof, an auxiliary reservoir disposed vertically at the side of the main reservoir and comprising flat side and top and bottom walls and curved outer wall, the inner edges of the side and top and bottom walls being welded to the side of the main reservoir, the wall of the main reservoir embraced by said auxiliary reservoir having openings therein opening to the top and bottom of the auxiliary reservoir, and a heat exchange unit and discharge flue for said combustion chamber disposed vertically within said auxiliary reservoir and having a, lateral inlet arm at its upper end disposed within said auxiliary reservoir and through the upper opening in said main reservoir wall and welded to the side of the combustion chamber at the top thereof, and a lateral discharge arm at its lower end disposed through the curved outer wall of said auxiliary reservoir adjacent the bottom thereof and welded thereto, :the curved outer wall of said auxiliary reservoir being concentric relative to the upright portion of said flue, said flue comprising a single conduit of substantial diameter extending continuously from the connection of the flue to the combustion chamber to the exit of the flue adjacent the bottom of the auxiliary reservoir, the wall of said conduit throughout the circumference and length of the conduit being formed separately from said side, top and bottom walls of the auxiliar reservoir, and the wall of the conduit being spaced from the side, top and bottom walls of the auxiliary reservoir.

3. A boiler comprising an upright combustion chamber, an upright main water reservoir concentrically surrounding said combustion chamber, the space between the side walls of the combustion chamber and the main reservoir being in the order of one inch, there being a substantially greater space between the top of the combustion chamber and the top of the water reservoir, the main reservoir having an inlet at the bottom thereof and an outlet at the top thereof, an auxiliary reservoir disposed vertically at the side of the main reservoir and comprising flat side and top and bottom walls and curved outer wall, the inner edges of the side and top and bottom walls being welded to the side of the main reservoir with the top of the auxiliary reservoir in approximately the plane of the top of the combustion chamber, the wall of the main reservoir embraced by said auxiliary reservoir having vertically spaced openings therein opening to the top and bottom of the auxiliary reservoir, the upper edge of the top opening being substantially flush with the top of the auxiliar reservoir, the lower edge of the bottom opening being substantially flush with the bottom of the auxiliary reservoir, and a heat exchange unit and discharge flue for said combustion chamber disposed vertically within said auxiliary reservoir and having a lateral inlet arm at its upper end disposed through the upper opening in said main reservoir wall and communicating with the combustion chamber at the top thereof, and a discharge arm at its lower end disposed through the wall of said auxiliary reservoir adjacent the bottom thereof, the space between the flue and the walls of said auxiliary reservoir and the adjacent side of the main reservoir being in the order of one inch.

4. A boiler comprising an upright combustion chamber, an upright main water reservoir concentrically surrounding said combustion chamber, an auxiliary reservoir disposed vertically at the side of the main reservoir and comprising side and top and bottom walls welded to the side of the main reservoir, the wall of the main reservoir embraced by said auxiliary reservoir having vertically spaced openings therein opening to the top and bottom of the auxiliary reservoir, and a heat exchange unit and discharge flue for said combustion chamber disposed vertically within said auxiliary reservoir and having a lateral inlet ann at its upper end disposed within said auxiliary reservoir and through the upper opening in said main reservoir wall and communicating with the combustion chamber at the top thereof, and a discharge arm at its lower end disposed through the wall of said auxiliary reservoir adjacent the bottom thereof, said flue comprising a single conduit of substantial diameter extending continuously from the connection of the flue to the combustion chamber to the exit of the flue adjacent the bottom of the auxiliar reservoir, the wall of said conduit throughout the circumference and length of the conduit being formed separately from said side, top and bottom walls of the auxiliary reservoir, and the wall of the conduit being spaced from the side, top and bottom walls of the auxiliary reservoir.

5. A boiler comprising an upright cylindrical combustion chamber of uniform diameter, 8, cylindrical upright main water reservoir of uniform diameter concentrically surrounding said com' bustion chamber, the main reservoir having an inlet at the bottom thereof and an outlet at the' top thereof, an auxiliary reservoir disposed vertically at the side of the main reservoir and comprising side and top and bottom walls having 5 their inner edges welded to the side of the main reservoir, the wall of the main reservoir embraced by said auxiliary reservoir having vertically spaced openings therein openin to the top and bottom of the auxiliary reservoir, and a heat exchange unit and discharge flue for said combustion chamber disposed vertically within said auxiliary reservoir and having a lateral inlet .arm at its upper end disposed through the upper opening in said main reservoir wall and welded to the side of the combustion chamber at the top thereof, and a lateral discharge arm at its lower end dis-posed through the wall of said auxiliary reservoir adjacent the bottom thereof and welded thereto, the

edge of said upper opening being spaced from 15 1,781,532

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,781,531 Summers Nov. 11, 1930 Summers Nov. 11, 1930 

